EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock...
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Transcript of EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock...
![Page 1: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/1.jpg)
EPA Precursor Gas Training Workshop
SO2 Precursor Gas Monitoring Training Overview
Lewis Weinstock
Solomon Ricks, U.S. EPA
Office of Air Quality Planning and Standards
![Page 2: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/2.jpg)
EPA Precursor Gas Training Workshop
Outline
• Methodology• Field test results• Responses to Calibrations
• Burden’s Creek SO2 Frequency Distribution
• Instrument Operations• Summary
![Page 3: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/3.jpg)
EPA Precursor Gas Training Workshop
Why measure trace levels of SO2
Objectives:• Emission strategy
development• Effectiveness of
reduction strategies• Validation of SO2 and
sulfate modeling predictions
• Long term trends analysis
• Health effect studiesNeed highly-sensitive ambient monitors deployed around these areas to determine CAIR’s effect on SO2 and related species.
![Page 4: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/4.jpg)
EPA Precursor Gas Training Workshop
Trace Level Sampling Challenges (SO2)
• Performance challenges– Lower noise for reduced LDL/MDL– Reduced zero and span drift– Increased rejection of interferences
• Trace level modifications– Special band-pass filter to increase NO rejection– Improved light baffling to reduce stray light– More powerful UV source lamp– Higher detector sensitivity– Longer optical bench
![Page 5: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/5.jpg)
EPA Precursor Gas Training Workshop
Methodology (UV Light Path)
SO2 + hv214nm SO2*
SO2* SO2 + hv330nm
![Page 6: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/6.jpg)
EPA Precursor Gas Training Workshop
Methodology (General Schematic)
General Diagram of a Precursor Gas SO2 Analyzer
![Page 7: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/7.jpg)
EPA Precursor Gas Training Workshop
Currently Available Trace-Level SO2 Options
Teledyne-API 100EUEQSA-0495-100
Ecotech EC9850TEQSA-0193-092
Thermo Electron 43C-TLEEQSA-0486-060(new model: 43i-TLE)
![Page 8: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/8.jpg)
EPA Precursor Gas Training Workshop
Testing Results – FieldApril 2006
Make/Model Thermo 43C-TLE (observed)
Averaging Time 60 seconds
Conc. Range 0-100 ppb
Zero Drift (0.200 ppb/day) 12 hr. (0.199 ppb)24 hr. (0.200 ppb)
Span Drift (1% FS per week) 20% FS (0.06%)80% FS (0.27%)
Precision (Coefficient of Variance)
0.91%
Bias +1.08%
LDL (0.100 ppb) 0.112 ppb
Noise (0.050 ppb) 0.029 ppb
Linearity (1% FS. M, B, and R2 reported)
1.0163x-0.454
R2 = 0.9995
MDL Observed 0.055 ppb (0.038 – 0.148 ppb CL)
![Page 9: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/9.jpg)
EPA Precursor Gas Training Workshop
SO2 TEI - Zero Drift - Burdens Creek
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
![Page 10: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/10.jpg)
EPA Precursor Gas Training Workshop
SO2 TEI - Span Drift at 90 ppb - Burdens Creek
-20.0%
-15.0%
-10.0%
-5.0%
0.0%
5.0%
10.0%
15.0%
20.0%
Recertified Environics calibrator
![Page 11: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/11.jpg)
EPA Precursor Gas Training Workshop
SO2 TEI - Precision Drift at 10 ppb - Burdens Creek
-20.0%
-15.0%
-10.0%
-5.0%
0.0%
5.0%
10.0%
15.0%
20.0%
Recertified Environics calibrator
?
![Page 12: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/12.jpg)
EPA Precursor Gas Training Workshop
Burdens Creek – Ambient Concentrations
Precision Level
Span Level
![Page 13: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/13.jpg)
EPA Precursor Gas Training Workshop
Burdens Creek – Ambient Concentrations
Burdens Creek Frequency Distribution - SO2
-2
0
2
4
6
8
10
12
99 90 75 50 25 10 1
Percentile
pp
b
![Page 14: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/14.jpg)
EPA Precursor Gas Training Workshop
Thermo 43C-TLE Diagnostic Parameters (5-11-07)
TEI Diagnostics Actual Reading Acceptance Criteria Acceptable?
Range 100 0 - 100 ppb Y
Averaging Time 60 10 – 300 seconds Y
SO2 Background 3.36 0 – 10 ppb Y
SO2 Span Coefficient 1.030 0.800 – 1.200 Y
PMT Voltage -604 ~ -600 V Y
Lamp Voltage 1211 500 - 1200 V N
Power (+5/+15/-15/Battery) 4.9/14.9/-14.9/3.4 + 0. 1V, >3.0 V Y
Internal temperature 36.8 8 – 47 degC Y
Chamber Temperature 45.2 43 – 47 degC Y
Chamber Pressure 729.5 650 – 760 mmHg Y
Sample Flow 0.587 0.5-1.0 l/min Y
UV Lamp Intensity 13,947 10,000 – 50,000 Hz Y
Change Particle Filter Y N Respan 89.8 PPB
![Page 15: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/15.jpg)
EPA Precursor Gas Training Workshop
Instrument Operation
Item Schedule
Check diagnostics (if not available remotely) Bi-weekly
Visual inspection and cleaning 6 months
Replace sample particulate filter Bi-weekly to monthly based on PM levels
Perform QC gas challenge (Level 1 and precision)
Bi-weekly (daily recommended)
Capillary inspection and replacement 6 months
Fan filter inspection and cleaning 6 months depending on surroundings
Lamp voltage check When lamp voltage approaches maximum (1200v)
![Page 16: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/16.jpg)
EPA Precursor Gas Training Workshop
Interferences
•Hydrocarbons
•Fluoresces in a fashion similar to SO2 when exposed to UV light
•Removed through the hydrocarbon “kicker”
•Nitrogen oxide
•NO fluoresces in a spectral range close to SO2
•Band pass filter enhances NO rejection
![Page 17: EPA Precursor Gas Training Workshop SO 2 Precursor Gas Monitoring Training Overview Lewis Weinstock Solomon Ricks, U.S. EPA Office of Air Quality Planning.](https://reader036.fdocuments.us/reader036/viewer/2022081518/551c39575503467b488b473a/html5/thumbnails/17.jpg)
EPA Precursor Gas Training Workshop
NO Rejection Test
0
20
40
60
80
100
120
NO
Con
cent
ratio
n, p
pb
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
SO2
Con
cent
ratio
n, p
pb
NO SO2
SO2 Response due to NO interference